My reason for writing stories is to give myself the satisfaction of visualising more clearly and detailedly and stably the vague, elusive, fragmentary impressions of wonder, beauty, and adventurous expectancy which are conveyed to me by certain sights (scenic, architectural, atmospheric, etc.), ideas, occurrences, and images encountered in art and literature.
I recognise a distinction between dream life and real life, between appearances and actualities. I confess to an over-powering desire to know whether I am asleep or awake--whether the environment and laws which affect me are external and permanent, or the transitory products of my own brain.
It is in dreams that I have known the real clutch of stark, hideous, maddening, paralysing fear. My infant nightmares were classics, & in them there is not an abyss of agonising cosmic horror that I have not explored. I don't have such dreams now - but the memory of them will never leave me. It is undoubtedly from them that the darkest & most gruesome side of my fictional imagination is derived.
Though not a participant in the Business of life; I am, like the character of Addison and Steele, an impartial (or more or less impartial) Spectator, who finds not a little recreation in watching the antics of those strange and puny puppets called men.
Religion itself is an absurdity and an anomaly, and paganism is acceptable only because it represents that purely orgiastic phase of religion farthest from reality.
Man's relations to man do not captivate my fancy. It is man's relation to the cosmos--to the unknown--which alone arouses in me the spark of creative imagination.
Non- Euclidean calculus and quantum physics are enough to stretch any brain; and when one mixes them with folklore, and tries to trace a strange background of multi-dimensional reality behind the ghoulish hints of Gothic tales and the wild whispers of the chimney-corner, one can hardly expect to be wholly free from mental tension. (Dreams In The Witch-House)
The appeal of the spectrally macabre is generally narrow because it demands from the reader a certain degree of imagination and a capacity for detachment from everyday life.
Contrary to what you may assume, I am not a pessimist but an indifferentist- that is, I don't make the mistake of thinking that the... cosmos... gives a damn one way or the the other about the especial wants and ultimate welfare of mosquitoes, rats, lice, dogs, men, horses, pterodactyls, trees, fungi, dodos, or other forms of biological energy.